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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-08-14 15:47:23 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-15 10:55:46 +0200
commit0f8e8ef7c204988246da5a42d576b7fa5277a8e4 (patch)
tree390bcd20b76bfa331e029c731ade1b6263e14684
parent8cf4e750f8459d51c2e8a035a201da4bf7aa996a (diff)
clocksource: Simplify clocksource watchdog resume logic
To resume the clocksource watchdog just remove the CLOCK_SOURCE_WATCHDOG bit from the watched clocksource. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Daniel Walker <dwalker@fifo99.com> LKML-Reference: <20090814134808.880925790@de.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/time/clocksource.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 76256c5aecb..89a7b91bfbd 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -145,7 +145,6 @@ static struct clocksource *watchdog;
static struct timer_list watchdog_timer;
static DEFINE_SPINLOCK(watchdog_lock);
static cycle_t watchdog_last;
-static unsigned long watchdog_resumed;
/*
* Interval: 0.5sec Threshold: 0.0625s
@@ -167,12 +166,9 @@ static void clocksource_watchdog(unsigned long data)
struct clocksource *cs, *tmp;
cycle_t csnow, wdnow;
int64_t wd_nsec, cs_nsec;
- int resumed;
spin_lock(&watchdog_lock);
- resumed = test_and_clear_bit(0, &watchdog_resumed);
-
wdnow = watchdog->read(watchdog);
wd_nsec = cyc2ns(watchdog, (wdnow - watchdog_last) & watchdog->mask);
watchdog_last = wdnow;
@@ -223,14 +219,26 @@ static void clocksource_watchdog(unsigned long data)
}
spin_unlock(&watchdog_lock);
}
+
+static inline void clocksource_reset_watchdog(void)
+{
+ struct clocksource *cs;
+
+ list_for_each_entry(cs, &watchdog_list, wd_list)
+ cs->flags &= ~CLOCK_SOURCE_WATCHDOG;
+}
+
static void clocksource_resume_watchdog(void)
{
- set_bit(0, &watchdog_resumed);
+ unsigned long flags;
+
+ spin_lock_irqsave(&watchdog_lock, flags);
+ clocksource_reset_watchdog();
+ spin_unlock_irqrestore(&watchdog_lock, flags);
}
static void clocksource_check_watchdog(struct clocksource *cs)
{
- struct clocksource *cse;
unsigned long flags;
spin_lock_irqsave(&watchdog_lock, flags);
@@ -256,8 +264,7 @@ static void clocksource_check_watchdog(struct clocksource *cs)
watchdog_timer.function = clocksource_watchdog;
/* Reset watchdog cycles */
- list_for_each_entry(cse, &watchdog_list, wd_list)
- cse->flags &= ~CLOCK_SOURCE_WATCHDOG;
+ clocksource_reset_watchdog();
/* Start if list is not empty */
if (!list_empty(&watchdog_list)) {
watchdog_last = watchdog->read(watchdog);